/*
 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package com.sun.java.swing.plaf.windows;

import java.awt.*;
import java.awt.event.*;

import java.io.*;
import java.util.*;

import javax.swing.plaf.basic.*;
import javax.swing.*;
import javax.swing.plaf.*;

import javax.swing.tree.*;

import static com.sun.java.swing.plaf.windows.TMSchema.*;
import static com.sun.java.swing.plaf.windows.XPStyle.Skin;


/**
 * A Windows tree.
 * <p>
 * <strong>Warning:</strong>
 * Serialized objects of this class will not be compatible with
 * future Swing releases.  The current serialization support is appropriate
 * for short term storage or RMI between applications running the same
 * version of Swing.  A future release of Swing will provide support for
 * long term persistence.
 *
 * @author Scott Violet
 */
public class WindowsTreeUI extends BasicTreeUI {

  public static ComponentUI createUI(JComponent c) {
    return new WindowsTreeUI();
  }


  /**
   * Ensures that the rows identified by beginRow through endRow are
   * visible.
   */
  protected void ensureRowsAreVisible(int beginRow, int endRow) {
    if (tree != null && beginRow >= 0 && endRow < getRowCount(tree)) {
      Rectangle visRect = tree.getVisibleRect();
      if (beginRow == endRow) {
        Rectangle scrollBounds = getPathBounds(tree, getPathForRow
            (tree, beginRow));

        if (scrollBounds != null) {
          scrollBounds.x = visRect.x;
          scrollBounds.width = visRect.width;
          tree.scrollRectToVisible(scrollBounds);
        }
      } else {
        Rectangle beginRect = getPathBounds(tree, getPathForRow
            (tree, beginRow));
        if (beginRect != null) {
          Rectangle testRect = beginRect;
          int beginY = beginRect.y;
          int maxY = beginY + visRect.height;

          for (int counter = beginRow + 1; counter <= endRow; counter++) {
            testRect = getPathBounds(tree,
                getPathForRow(tree, counter));
            if (testRect != null && (testRect.y + testRect.height) > maxY) {
              counter = endRow;
            }
          }

          if (testRect == null) {
            return;
          }

          tree.scrollRectToVisible(new Rectangle(visRect.x, beginY, 1,
              testRect.y + testRect.height -
                  beginY));
        }
      }
    }
  }

  static protected final int HALF_SIZE = 4;
  static protected final int SIZE = 9;

  /**
   * Returns the default cell renderer that is used to do the
   * stamping of each node.
   */
  protected TreeCellRenderer createDefaultCellRenderer() {
    return new WindowsTreeCellRenderer();
  }

  /**
   * The minus sign button icon
   * <p>
   * <strong>Warning:</strong>
   * Serialized objects of this class will not be compatible with
   * future Swing releases.  The current serialization support is appropriate
   * for short term storage or RMI between applications running the same
   * version of Swing.  A future release of Swing will provide support for
   * long term persistence.
   */
  public static class ExpandedIcon implements Icon, Serializable {

    static public Icon createExpandedIcon() {
      return new ExpandedIcon();
    }

    Skin getSkin(Component c) {
      XPStyle xp = XPStyle.getXP();
      return (xp != null) ? xp.getSkin(c, Part.TVP_GLYPH) : null;
    }

    public void paintIcon(Component c, Graphics g, int x, int y) {
      Skin skin = getSkin(c);
      if (skin != null) {
        skin.paintSkin(g, x, y, State.OPENED);
        return;
      }

      Color backgroundColor = c.getBackground();

      if (backgroundColor != null) {
        g.setColor(backgroundColor);
      } else {
        g.setColor(Color.white);
      }
      g.fillRect(x, y, SIZE - 1, SIZE - 1);
      g.setColor(Color.gray);
      g.drawRect(x, y, SIZE - 1, SIZE - 1);
      g.setColor(Color.black);
      g.drawLine(x + 2, y + HALF_SIZE, x + (SIZE - 3), y + HALF_SIZE);
    }

    public int getIconWidth() {
      Skin skin = getSkin(null);
      return (skin != null) ? skin.getWidth() : SIZE;
    }

    public int getIconHeight() {
      Skin skin = getSkin(null);
      return (skin != null) ? skin.getHeight() : SIZE;
    }
  }

  /**
   * The plus sign button icon
   * <p>
   * <strong>Warning:</strong>
   * Serialized objects of this class will not be compatible with
   * future Swing releases.  The current serialization support is appropriate
   * for short term storage or RMI between applications running the same
   * version of Swing.  A future release of Swing will provide support for
   * long term persistence.
   */
  public static class CollapsedIcon extends ExpandedIcon {

    static public Icon createCollapsedIcon() {
      return new CollapsedIcon();
    }

    public void paintIcon(Component c, Graphics g, int x, int y) {
      Skin skin = getSkin(c);
      if (skin != null) {
        skin.paintSkin(g, x, y, State.CLOSED);
      } else {
        super.paintIcon(c, g, x, y);
        g.drawLine(x + HALF_SIZE, y + 2, x + HALF_SIZE, y + (SIZE - 3));
      }
    }
  }

  public class WindowsTreeCellRenderer extends DefaultTreeCellRenderer {

    /**
     * Configures the renderer based on the passed in components.
     * The value is set from messaging the tree with
     * <code>convertValueToText</code>, which ultimately invokes
     * <code>toString</code> on <code>value</code>.
     * The foreground color is set based on the selection and the icon
     * is set based on on leaf and expanded.
     */
    public Component getTreeCellRendererComponent(JTree tree, Object value,
        boolean sel,
        boolean expanded,
        boolean leaf, int row,
        boolean hasFocus) {
      super.getTreeCellRendererComponent(tree, value, sel,
          expanded, leaf, row,
          hasFocus);
      // Windows displays the open icon when the tree item selected.
      if (!tree.isEnabled()) {
        setEnabled(false);
        if (leaf) {
          setDisabledIcon(getLeafIcon());
        } else if (sel) {
          setDisabledIcon(getOpenIcon());
        } else {
          setDisabledIcon(getClosedIcon());
        }
      } else {
        setEnabled(true);
        if (leaf) {
          setIcon(getLeafIcon());
        } else if (sel) {
          setIcon(getOpenIcon());
        } else {
          setIcon(getClosedIcon());
        }
      }
      return this;
    }

  }

}
